Measuring battery consumption in twin engine?

[Valeria]

Hi, I'm about to build a twin engine plane and I am curious about the possibility to measure the battery consumption on both batteries.
The setup would be: 2 brushless connected to 2 speed controls (with BEC disabled) each speed control feeding from 1 battery. Can I see the consumption for only 1 battery? the sum of both batteries? independent readings? (extra sensors?).

Another question is: can the OSD feed the RX and camera and video TX and itself? all at the same time? So I would have two big batteries feeding the engines and one smaller for everything else.

The other opiton would be to only disable one BEC, but in that case one engine battery would drain faster than the other (very bad for twin engines).

One more thing, the throttle channel controls both engines with a Y cable.

[Alex Villa]

RVOSD only have one current sensor. You can only measure one of the independent power rails. However if you use a single battery to power both ESCs thru the current sensor (max amps = 130 A) RVOSD will display consumption of both motors.

The second battery input on RVOSD only can display voltage for that battery

Yes the onboard Switched regulator can feed camera and Tx, and the system is able to supply 12V also if appropriate jumpers selected.

If both batteries are equal i think you can make a parallel conection resulting in a higher capacity battery and feed both ESCs thru current sensor.

[Valeria]

Thanks, I like the idea of parallel engine battery, that way both engines will get the same current. That way I can also feed the Rx with a BEC and not unbalance the engines.

[kelly]

what happens when you go over the 70 amp limit of the current sensor with two motors set up like that? just one of my motors pulls 40+ amps 710 watts each